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Effect of Temperature and Mass Concentration on the Hydrolysis of Fluorine-rich Hafnium Complex in High Temperature and High Pressure Fluids(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第03期
Page:
327-331
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Effect of Temperature and Mass Concentration on the Hydrolysis of Fluorine-rich Hafnium Complex in High Temperature and High Pressure Fluids
Author(s):
LIU Jun-feng1;  HUANG Jian-jun2;  LI Zhen1;  LIU Xiao-wen1;  DING Xing3
(1. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Shaanxi Institute of Geological Survey, Xi’an 710054, Shaanxi, China; 3. State Key Laboratory of Isotope Geochemistry, Guangzhou Instituteof Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China)
Keywords:
Hf;  K2HfF6 complex;  hydrolysis;  high temperature and high pressure;  fluorine-rich fluid;  mass concentration;  cumulative hydrolysis equilibrium constant;  hydrothermal solution
PACS:
P595; O614.41+3
DOI:
-
Abstract:
Hf is a high field strength element(HFSE)with low abundance in the earth’s crust, and often enters zircon in the form of isomorphism. The migration behavior of Hf in natural geological processes was studied by observing the hydrolysis degree of K2HfF6 complex in hydrothermal solution. The results show that K2HfF6 complex could undergo hydrolysis reaction to a certain extent under hydrothermal conditions, and the general trend is that the lower the initial mass concentration of the complex and the higher the reaction temperature, the more severe the hydrolysis degree and the lower the stability of the complex; the cumulative hydrolysis equilibrium constant of K2HfF6 complex under high temperature and high pressure is obtained. At the same time, according to the content of Hf in the extraction solution, the content of Hf in the fluoride-rich fluid can be estimated based on the method of experimental simulation; if the ion group migrates with the highest coordination of K2HfF6, the ratio of mass concentrations between Hf and F is 1.6, so the minimum content of F required for the mineralization fluid can be calculated.

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Last Update: 2019-05-20